JPH07101567B2 - Insulated wire / cable - Google Patents
Insulated wire / cableInfo
- Publication number
- JPH07101567B2 JPH07101567B2 JP62156175A JP15617587A JPH07101567B2 JP H07101567 B2 JPH07101567 B2 JP H07101567B2 JP 62156175 A JP62156175 A JP 62156175A JP 15617587 A JP15617587 A JP 15617587A JP H07101567 B2 JPH07101567 B2 JP H07101567B2
- Authority
- JP
- Japan
- Prior art keywords
- rust preventive
- cable
- insulator
- eva
- conductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
Description
【発明の詳細な説明】 〈産業上の利用分野〉 本発明は、絶縁電線・ケーブル、特に架空絶縁配電線に
用いて有用なものに関する。DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to an insulated electric wire / cable, particularly one useful for an aerial insulated distribution line.
〈従来の技術〉 従来、架空絶縁配電線としては、ポリエチレン絶縁電線
が汎用されているが、この種の電線では、導体側への水
分の侵入により、導体の応力腐食割れが起こるという問
題点があった。<Prior Art> Conventionally, polyethylene insulated wires have been widely used as aerial insulated power distribution lines, but with this type of wire, there is the problem that stress corrosion cracking of the conductor occurs due to the ingress of moisture into the conductor side. there were.
この導体の応力腐食割れの対策として、絶縁体にベンゾ
トリアゾール（BTA）またはこのBTA系の防錆剤を添加す
る方法が講じられている。この防錆剤は、導体側に徐々
に移行して、導体素線表面に防錆膜を形成する等の作用
により、導体の応力腐食割れを防止する機能を有する。As a countermeasure against the stress corrosion cracking of the conductor, a method of adding benzotriazole (BTA) or this BTA-based rust preventive agent to an insulator has been taken. This rust preventive agent has a function of preventing stress corrosion cracking of the conductor by gradually moving to the conductor side and forming an rust preventive film on the surface of the conductor wire.
〈発明が解決しようとする問題点〉 ところが、このBTAまたはこのBTA系の防錆剤は、ポリエ
チレン絶縁体に対して相溶性が悪いために、防錆剤のブ
リードが生じるという問題があった。<Problems to be Solved by the Invention> However, since this BTA or this BTA-based rust preventive agent has poor compatibility with the polyethylene insulator, there is a problem that bleeding of the rust preventive agent occurs.
このブリードを防ぐため、防錆剤に対して、相溶性のよ
い、例えばエチレン−酢酸ビニル共重合体（EVA）を添
加する方法が提案されているが、必ずしもうまく行われ
ていなかった。In order to prevent this bleeding, a method of adding, for example, an ethylene-vinyl acetate copolymer (EVA) having good compatibility to the rust preventive agent has been proposed, but it has not always been successful.
なぜなら、使用するEVAの特性や添加量の範囲を誤る
と、防錆剤が絶縁体中からブリードとして出てくるこ
と、絶縁体の押出中にEVAが絶縁体からブリードして
きて、製造の障害となること、等の問題があった。This is because if the characteristics of EVA used and the range of the amount added are incorrect, the rust preventive agent will come out as bleeding from the inside of the insulator, and EVA will bleed out of the insulator during extrusion of the insulator, resulting in a manufacturing obstacle. There were problems such as becoming.
本発明は、このような従来の問題点を解決するためにな
されたものである。The present invention has been made to solve such conventional problems.
〈問題点を解決するための手段及びその作用〉 かゝる本発明の特徴とする点は、絶縁体が、ポリエチレ
ンと、0.5〜５重量％のベンゾトリアゾール（BTA）また
はベンゾトリアゾール系の防錆剤と、酢酸ビニル含有量
（VA％）が15〜24％で、組成物中の酢酸ビニル含有量が
１％以上となるように添加されたエチレン−酢酸ビニル
共重合体とからなる絶縁電線・ケーブルにある。<Means for Solving Problems and Their Actions> Such a feature of the present invention is that the insulator is polyethylene and 0.5 to 5% by weight of benzotriazole (BTA) or benzotriazole-based rust preventive agent. Wire containing an agent and an ethylene-vinyl acetate copolymer added such that the vinyl acetate content (VA%) is 15 to 24% and the vinyl acetate content in the composition is 1% or more. On the cable.
本発明で用いるEVAの酢酸ビニル含有量（VA％）を15〜2
4％としたのは、VA％が15％未満の場合、防錆剤との相
溶性が悪く、防錆剤のブリードが有り、また24％を越え
ると、ポリエチレンとEVAとの相溶性が悪くなり、絶縁
体の押出加工時にEVAがブリードするようになるからで
ある。また、このEVAの添加量を、ポリエチレンをベー
スとする組成物に対して、そのVA％を１％以上としたの
は、１％未満では、防錆剤との相溶性が悪く、ブリード
が発生するからである。The EVA used in the present invention has a vinyl acetate content (VA%) of 15 to 2
4% means that if the VA% is less than 15%, the compatibility with the antirust agent is poor and there is bleeding of the antirust agent, and if it exceeds 24%, the compatibility with polyethylene and EVA is poor. This is because the EVA will bleed when the insulator is extruded. In addition, the VA% of the EVA added was 1% or more with respect to the polyethylene-based composition. If it is less than 1%, the compatibility with the rust preventive agent is poor and bleeding occurs. Because it does.
また、本発明において、ベンゾトリアゾール（BTA）ま
たはこのBTA系の防錆剤の添加量を0.5〜５重量％とした
のは、0.5重量％未満では、導体の応力腐食割れ防止の
効果が十分なく、５％より多いときには、大き過ぎてブ
リードの発生が顕著となるからである。Further, in the present invention, the amount of benzotriazole (BTA) or the BTA-based rust preventive added is 0.5 to 5% by weight because the effect of preventing stress corrosion cracking of the conductor is insufficient if the amount is less than 0.5% by weight. This is because when it is more than 5%, it is too large and the occurrence of bleeding becomes remarkable.
なお、本発明の絶縁電線・ケーブルにおいては、必要に
より、予め撚線等の導体自体に防錆処理を施しておくと
よい。また、この絶縁体に所定量の酸化防止剤、耐候用
カーポンブラック、無機フィラー等を必要により添加す
ることも可能である。In the insulated wire / cable of the present invention, the conductor itself such as a stranded wire may be subjected to rust-prevention treatment if necessary. It is also possible to add a predetermined amount of an antioxidant, weather resistant carbon black, inorganic filler, etc. to this insulator, if necessary.
〈実施例〉 メルトインデックス（M1）が0.8の低密度ポリエチレン
に種々のVA％のEVAを所定量配合し、これに防錆剤BTAを
１重量％添加して絶縁体を作り、この絶縁体を用いて、
ポリエチレン絶縁電線を製造した（実施例１〜３、比較
例１〜３）。この電線の導体は19本撚り、公称断面積60
mm2であり、予め防錆処理および応力緩和処理を施して
ある。この絶縁体の被覆は200℃で導体上に押出して行
い、その厚さは2.5mmとした。<Example> A low density polyethylene having a melt index (M1) of 0.8 was mixed with a predetermined amount of various VA% EVA, and 1% by weight of a rust preventive agent BTA was added to this to prepare an insulator. make use of,
Polyethylene insulated wires were manufactured (Examples 1 to 3, Comparative Examples 1 to 3). The conductor of this wire has 19 strands and a nominal cross-sectional area of 60.
It is mm 2 , and has been subjected to rust prevention treatment and stress relaxation treatment in advance. The insulation was extruded onto the conductor at 200 ° C. and had a thickness of 2.5 mm.
このようにして得られた各電線について、以下の試験を
行ったところ、その結果は、第１表の如くであった。The following tests were conducted on each of the electric wires thus obtained, and the results are shown in Table 1.
（１）防錆剤ブリード試験 試料電線を50℃で２週間保存し、絶縁体表面の防錆剤ブ
リードの有無を調べて行った。(1) Anticorrosion agent bleed test The sample electric wires were stored at 50 ° C for 2 weeks, and examined for the presence of rust inhibitor bleed on the surface of the insulator.
（２）EVAブリード試験、 絶縁体押出中におけるEVAブリード物の有無を調べて行
った。(2) EVA bleed test, conducted by examining the presence or absence of EVA bleed during extrusion of the insulator.
（３）防錆試験 30cmの電線サンプルをNH4OH溶液（NH4 +イオン:100ppm）
に浸漬した。この際、溶液深さ20cmで１日、溶液深さ10
cmで６日を１サイクルとした乾湿サイクルを設定し、60
℃×１日８時間、20℃（室温）×１日16時間のサイクル
で、４週間浸漬試験を行った後、絶縁体を剥ぎ、導体変
色の有無を調べて行った。(3) Anticorrosion test A 30 cm wire sample is NH 4 OH solution (NH 4 + ion: 100 ppm)
Soaked in. At this time, the solution depth of 20 cm, 1 day, the solution depth of 10
We set a dry and wet cycle with 6 days as one cycle in cm, 60
After a dipping test was conducted for 4 weeks in a cycle of 8 hours for 8 hours per day and 16 hours for 20 hours at room temperature (room temperature), the insulation was peeled off and the presence or absence of discoloration of the conductor was examined.
上記第１表から、本発明の場合、すべての特性の面で優
れていることが判る 〈発明の効果〉 このように本発明によれば、防錆剤およびEVAのブリー
ドのない、防錆性能に優れた絶縁電線・ケーブルを提供
することができる。 It can be seen from Table 1 above that the present invention is excellent in all properties. <Effects of the Invention> As described above, according to the present invention, the rust preventive performance without bleeding of the rust preventive agent and EVA is obtained. It is possible to provide excellent insulated wires and cables.
フロントページの続き (56)参考文献 特開 昭60−72943（ＪＰ，Ａ) 特開 昭58−194210（ＪＰ，Ａ) 特開 昭62−35408（ＪＰ，Ａ) 特開 昭59−60819（ＪＰ，Ａ)Continuation of the front page (56) Reference JP-A-60-72943 (JP, A) JP-A-58-194210 (JP, A) JP-A-62-35408 (JP, A) JP-A-59-60819 (JP , A)
Claims (1)
％のベンゾトリアゾール（BTA）またはベンゾトリアゾ
ール系の防錆剤と、酢酸ビニル含有量（VA％）が15〜24
％で、組成物中の酢酸ビニル含有量が１％以上となるよ
うに添加されたエチレン−酢酸ビニル共重合体とからな
る絶縁電線・ケーブル。1. An insulating material comprising polyethylene, 0.5 to 5% by weight of benzotriazole (BTA) or benzotriazole-based rust preventive, and a vinyl acetate content (VA%) of 15 to 24.
%, An insulated wire / cable comprising an ethylene-vinyl acetate copolymer added such that the vinyl acetate content in the composition is 1% or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62156175A JPH07101567B2 (en) | 1987-06-23 | 1987-06-23 | Insulated wire / cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62156175A JPH07101567B2 (en) | 1987-06-23 | 1987-06-23 | Insulated wire / cable |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JPH01604A JPH01604A (en) | 1989-01-05 |
| JPS64604A JPS64604A (en) | 1989-01-05 |
| JPH07101567B2 true JPH07101567B2 (en) | 1995-11-01 |
Family
ID=15621994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62156175A Expired - Lifetime JPH07101567B2 (en) | 1987-06-23 | 1987-06-23 | Insulated wire / cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07101567B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3761606B2 (en) * | 1995-07-07 | 2006-03-29 | 株式会社フジクラ | Manufacturing method of insulation composition for electric wire |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6043306B2 (en) * | 1978-12-16 | 1985-09-27 | タツタ電線株式会社 | Anti-corrosion separator film |
| JPS57210511A (en) * | 1981-06-22 | 1982-12-24 | Dainichi Nippon Cables Ltd | Method of producing watertight twisted conductor |
| JPS5846811A (en) * | 1981-09-11 | 1983-03-18 | 住友電気工業株式会社 | Corrosion prevention method for insulated wires |
| JPS5960819A (en) * | 1982-09-29 | 1984-04-06 | 株式会社フジクラ | Watertight insulated wire |
| JPS6072943A (en) * | 1983-09-30 | 1985-04-25 | Dainichi Nippon Cables Ltd | Polyolefin composition |
| JPS6235408A (en) * | 1985-08-06 | 1987-02-16 | 住友電気工業株式会社 | Wire for outside wiring |
-
1987
- 1987-06-23 JP JP62156175A patent/JPH07101567B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS64604A (en) | 1989-01-05 |
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